Your welcome and I had a hard time understanding manufacturers using this concept when I first learned about it a few years ago. However manufacturing today is basically run by the bean counters and no longer by Quality and Design engineers. Marketing today basically is told to sell whatever the accounts decide they can get away with even though they themselves possess no product knowledge at all. I believe this is what destroys most US companies today. o be fair to Apple they are by no means the only ones doing this, but it does surprise me that with their customer base being quality minded people willing to pay more for decent quality, they would tarnish their rep by doing this. I understand HP, Del, Etc doing it because they are al about low cost in the business models but to me Apple doing this is like Rolls Royce using chevy engines to save a buck. In the end it will bite them and I think people are starting to catch on in larger numbers about this practice nowadays.
Anyway there used to be a way to find out the display model in your system by going to certain area in the properties. I wish I could remember where it was now. It was back in mid 2007 when I tried it last. From what I remember, what you want to have is the LG model and not the Samsung. The LG was light years nicer quality. If I figure out where this property is located again I will post it back for you or if one of the other knowledgeable members here can tell us, that would be great.
As far as I remember Apple uses at least 3 panel makers for the 15" MBP.